(E2;21+→01+) value in 90Kr

J.-m. Régis, J. Jolie, N. Saed-samii, N. Warr, M. Pfeiffer, A. Blanc, M. Jentschel, U. Köster, P. Mutti, T. Soldner, G. S. Simpson, F. Drouet, A. Vancraeyenest, G. De France, E. Clément, O. Stezowski, C. A. Ur, W. Urban, P. H. Regan, Zs. PodolyákC. Larijani, C. Townsley, R. Carroll, E. Wilson, L. M. Fraile, H. Mach, V. Paziy, B. Olaizola, V. Vedia, A. M. Bruce, O. J. Roberts, J. F. Smith, T. Kröll, A.-l. Hartig, A. Ignatov, S. Ilieva, M. Thürauf, S. Lalkovski, D. Ivanova, S. Kisyov, W. Korten, M.-d. Salsac, M. Zielińska, N. Mărginean, D. G. Ghită, R. Lică, C. M. Petrache, A. Astier, R. Leguillon

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19 Citations (Scopus)

Abstract

A smooth onset of collectivity in 88, 92,94,96 Kr has been determined from reported B (E2;2+1→0+1) and E(2+1) values. This is in contrast to the sudden onset in even-even Zr, Mo, and Sr isotopes. Our objective was to complete the systematics by determining the B (E2;2+1→0+1) value in 90Kr, which was produced by cold-neutron-induced fission of 235U. The lifetime of the 2+1state in 90 Kr was measured via the electronic γ−γ timing technique using the EXILL and FATIMA spectrometers. Based on the measured mean lifetime of τ = 15(10)ps, the B(E2;2+1→0+1) value of 13+26−5 W.u. in 90 Kr is determined for the first time and the smooth onset of deformation in the even-even Kr isotopes beyond neutron number N=50 is confirmed.
Original languageEnglish
Article number067301
Number of pages4
JournalPhysical Review C
Volume90
Issue number6
DOIs
Publication statusPublished - 1 Dec 2014

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